MSD crank trigger

[Mike Ganoe]

Hello,

Working on my daughter's footbrake car. Going to change over to MSD grid system and want to add crank trigger set up also. Measured balancer on motor (350 Chevy) at 6.5 inches. Only
crank trigger wheels I see are 6.25 inches or 7 inches. Which one do I need?

Thanks
Mike

[Pool Man]

I would think you would need the larger diameter. The reason I say that is due to setting the pickup. It needs (IIRC) to be approx. .080 from the edge of the wheel. If you were to use the smaller wheel then you would not be able to set the proper distance due to it hitting the balancer before you get to the .080. Most I have seen however are just small amount larger if not the same size as the balancer. I see nothing wrong with using one larger.